Strong ratings for the first 4 episodes of Grimm have convinced NBC to give the show a full season order. NBC will also be testing out Grimm in a Thursday time slot on December 8th. Another new episode will follow December 9th at it's normal time.

We're hearing that the full season order will bring Grimm to a total of 22 episodes for its first season, but we'll provide another update as soon as that has officially been confirmed. Grimm is on a holiday break for the rest of November, but will return on December 8th for its 5th episode, titled "Danse Macabre".

"Portland homicide Detective Nick Burkhardt (David Giuntoli, Turn the Beat Around) discovers he is descended from an elite line of criminal profilers known as “Grimms,” charged with keeping balance between humanity and the mythological creatures of the world. As he tries to hide the dangers of his newfound calling from his fiancée, Juliette Silverton (Bitsie Tulloch, “Quarterlife”), and his partner, Hank Griffin (Russell Hornsby, “Lincoln Heights”), he becomes ever more entrenched in the ancient rivalries and alliances of the Grimm world.

With help from his confidant, Monroe (Silas Weir Mitchell, “Prison Break”), a reformed Grimm creature himself, Nick must navigate through the forces of a larger-than-life mythology, facing off with Hexenbiests, Blutbads, and all manner of ancient evils, including royal lines dating back to the original profilers themselves, The Grimm Brothers. Reggie Lee (“Persons Unknown”) and Sasha Roiz (“Caprica”) also star."